Preparing for Router Installation
Site Electrical Wiring Guidelines
When planning the electrical wiring at your site, consider the factors
discussed in the following sections.
Distance Limitations for Signaling
Improperly installed wires can emit radio interference. In addition, the potential
for damage from lightning strikes increasesif wires exceed recommended
distances, or if wirespass between buildings. The electromagnetic pulse (EMP)
caused by lightning can damage unshielded conductorsand destroy electronic
devices. If your site has previousl y experienced such problems, you might want
to consult experts in electrical surgesuppression and shielding.
Radio Frequency Interference
You can reduce or eliminate the emission of radio frequency interference (RFI) from
your site wiring by usingtwisted-pair cable with a good distribution of grounding
conductors. If you must exceed the recommended distances,use a high-quality
twisted-pair cable with one ground conduc torfor ea ch data signal when applicable.
Electromagnetic Compatibility
If your site is susceptible toproblems with electromagnetic compatibility
(EMC), particularly from lightning or radiotransmitters, you might want to
seek expert advice. Strong sources of electromagnetic interference(EMI) can
destroy the signal drivers and receivers in the router and conduct power
surges over the lines into the equipment, resulting in an electrical hazard.
It is particularly important to providea properly grounded and shielded
environment and to use electrical surge-sup pression devices.
CAUTION: To comply with intrabuilding lightning/surge requirements,intrabuilding
wiring must be shielded, and the shield forthe wiring must be grounded at both
ends.
Router Power Requirements
Table16 lists the power requirements for various hardwarecomponents
when the router is operating under typical voltage conditions. For PIC power
requirements, see the M160 Internet Router PIC Guide.
Power Guidelines, Requirements,and Specifications 65